CODEWITHSUNDEEP
pythonqtpython-3.xpyqtpyqt5
syedelec
syedelec

Reputation: 1300

pyqt - Frameless widget weird titlebar appears

I noticed a weird behavior when running a frameless widget in PyQt. If I minimize it in taskbar multiple times, a Windows XP title bar appears in the top left corner during a few milliseconds and then disappears.

Here is a simple code to reproduce the problem :

import sys

from PyQt5 import QtCore, QtWidgets


if __name__ == "__main__":
    app = QtWidgets.QApplication(sys.argv)
    ui = QtWidgets.QWidget()
    ui.setWindowFlags(ui.windowFlags() | QtCore.Qt.FramelessWindowHint)
    ui.show()
    sys.exit(app.exec_())

The behavior is described in this video

My setup is Windows 7 (x64), Python 3.5 and PyQt5.7 (FYI, the problem was also present in PyQt5.6)

Can anyone explain this behavior and give a solution ?

Upvotes: 1

Views: 960

Answers (2)

niklas
niklas

Reputation: 43

If anyone still has problems with it:

  • make the window translucent
  • create a widget that u can use as a window

Example:

    class MainWindow(QtWidgets.QMainWindow):

        def __init__(self):
            super(MainWindow, self).__init__()

            self.width = 400
            self.height = 220

            self.initUI()

        def initUI(self):

            self.setWindowFlags(Qt.FramelessWindowHint)
            self.setFixedSize(self.width, self.height)

            self.setAttribute(Qt.WA_TranslucentBackground)

            self.window = QtWidgets.QWidget(self)
            self.window.setStyleSheet("QWidget{background-color: #ffffff;}")
            self.window.setGeometry(0, 0, self.width, self.height)

            self.minimize_button = QtWidgets.QPushButton("🗕", self.window)
            self.minimize_button.setGeometry(355, 2, 20, 20)
            self.minimize_button.clicked.connect(self.minimize_window)

        def minimize_window(self):
            self.setWindowState(QtCore.Qt.WindowMinimized)

Now the title bar does not appear anymore, due to the window being invisible.

Upvotes: 1

syedelec
syedelec

Reputation: 1300

I reported the issue to Qt and it seems to be a general Windows bug :

Sergio Martins added a comment

I can reproduce this problem with a pure Windows example, (passing WS_VISIBLE | WS_POPUP | WS_SYSMENU | WS_MINIMIZEBOX to CreateWindowEx()). Doesn't seem fixable, other than removing the minimize button capability.

Upvotes: 2

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